Flow Pathways and Sediment Trapping in a Field-Scale Vegetative Filter

dc.contributor.author Helmers, Matthew
dc.contributor.author Eisenhauer, Dean
dc.contributor.author Helmers, Matthew
dc.contributor.author Dosskey, Michael
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-13T07:11:26.000
dc.date.accessioned 2020-06-29T22:38:41Z
dc.date.available 2020-06-29T22:38:41Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 2005
dc.date.embargo 2013-03-11
dc.date.issued 2005-01-01
dc.description.abstract <p>Vegetative filters (VF) are a best management practice installed in many areas to control sediment movement to water bodies. It is commonly assumed that runoff proceeds perpendicularly across a VF as sheet flow. However, there is little research information on natural pathways of water movement and performance of field-scale VF. The objectives of this study were: (1) to quantify the performance of a VF where the flow path is not controlled by artificial borders and flow path lengths are field-scale, and (2) to develop methods to detect and quantify overland flow convergence and divergence in a VF. Our hypothesis is that flow converges and diverges in field-scale VF and that flow pathways that define flow convergence and divergence areas can be predicted using high-resolution topography (i.e., maps). Overland flow and sediment mass flow were monitored in two 13 × 15 m subareas of a 13 × 225 m grass buffer located in Polk County in east-central Nebraska. Monitoring included a high-resolution survey to 3 cm resolution, dye tracer studies to identify flow pathways, and measurement of maximum flow depths at 51 points in each subarea. Despite relatively planar topography (a result of grading for surface irrigation), there were converging and diverging areas of overland flow in the buffer subareas. Convergence ratios ranged from -1.55 to 0.34. Predicted flow pathways using the high-resolution topography (i.e., map) closely followed actual flow paths. Overland flow was not uniformly distributed, and flow depths were not uniform across the subareas. Despite converging and diverging flow, the field-scale VF trapped approximately 80% of the incoming sediment.</p>
dc.description.comments <p>This article is from <em>Transactions of the ASABE </em>48, no. 3 (2005): <a href="http://elibrary.asabe.org/abstract.asp?aid=18508&t=3&dabs=Y&redir=&redirType=" target="_blank">955–968</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/299/
dc.identifier.articleid 1584
dc.identifier.contextkey 3888126
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/299
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1049
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/299/2005_HelmersMJ_FlowPathways.pdf|||Fri Jan 14 23:15:54 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Flow convergence
dc.subject.keywords Grass filters
dc.subject.keywords Overland flow
dc.subject.keywords Sediment trapping
dc.subject.keywords Vegetative filters
dc.title Flow Pathways and Sediment Trapping in a Field-Scale Vegetative Filter
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 26a812e6-e6de-44ff-b7ea-d2459ae1903c
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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